Skeletal Muscle Limits the Exercise Tolerance of Renal Transplant Recipients: Effects of a Graded Exercise Training Program G. Kempeneers, SSe, T.O. Noakes, MS, ChS, MO, R. van Zyl-Smit, MS, SCh, FCp, FRCp, MO, K.H. Myburgh, PhD, M. Lambert MSe, S. Adams, SSe, SSe Hans, and T. Wiggins • Sixteen renal transplant recipients were studied before and after they had participated in a 24-week exercise training program to determine (1) the nature of the factors explaining their impaired exercise tolerance, and (2) their adaptative responses to exercise training. During progressive treadmill exercise to exhaustion prior to training, renal transplant recipients stopped exercising at lower peak rates of oxygen consumption (V0 2max) (29.0 ± 7.8 v 47.9 ± 9.1 mL 02-kg- 1-min- 1; P